I have never been able to sleep mid-day (take naps) since I was 5 or 6. It upset my parents of course, when I was still "napping age" but "refused" to do so. Plenty of times as an adult I've been exhausted and still couldn't sleep. Cool room, blackout curtains, even a basement room without windows and away from other sounds wasn't enough.
Yesterday I pushed my spouse in a wheelchair for a bit in the park before we left because of the heat. I was out the minute I laid down and woke up 6 or 7 hours later still feeling like shit.
If my grandparents were around, I'm sure they wouldn't have made it through this summer since they never had AC